2017年与2014年西安极端高温天气及其环流特征对比分析

Abstract

Abstract: A comparative study on the basic features and causes of high temperature in Xi’an during the period from 2017 to 2014 was carried out based on the observed and analyzed data from the meteorological stations and the National Center for Environmental Prediction. The main results were as follows: ① High temperature occurred with a conventional modal in Xi’an in 2014. However, high temperature occurred one month in advance (unconventional) in 2017, and this was mainly because that the South Asia High (SH) was stronger than that in the same period in conventional years; ② It was dry high temperature in Xi’an and different from the muggy high temperature in south China. Moreover, the diurnal-nocturnal temperature variation was low; ③ The typical circulation features related to the high temperature in Xi’an were described in detail, including mainly the simultaneously enhanced SH and Western Pacific Subtropical High (WH); ④ SH was an important heat source affecting northwest China according to this study. Under the favorable conditions of deeply meridional circulation, heat air was transported southeastward to the downstream region (e.g. Xi’an) by strong wind; ⑤ With the configuration of up-convergence and down-divergence, sinking airflow was clearly found under the 500 hPa level, and other meteorological factors were also favorable for the occurrence of high temperature in Xi’an.

Key words: extremely high temperature, atmospheric circulation, South Asia High (SH), Western Pacific Subtropical High (WH), Xi’an

LI Bo, CHEN Ting, WANG Nan, HUA Deng-xin, WANG Qian. Extremely High Temperature and Circulation Features in Xi'an in 2017 and 2014[J].Arid Zone Research, 2019, 36(3): 645-656.

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Extremely High Temperature and Circulation Features in Xi'an in 2017 and 2014

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